selinon.errors module¶

Errors and exceptions that can occur in Selinon code base.

exception selinon.errors.CacheMissError[source]¶

Bases: selinon.errors.SelinonException

An error raised when there is requested an item from cache that is not stored in cache.

exception selinon.errors.ConfigNotInitializedError[source]¶

Bases: selinon.errors.SelinonException

An error raised when the configuration was requested, but not initialized.

exception selinon.errors.ConfigurationError[source]¶

Bases: selinon.errors.SelinonException

Raised on errors that indicate errors in the configuration files.

exception selinon.errors.DispatcherRetry(keep_state=True, adjust_retry_count=True)[source]¶

Bases: selinon.errors.SelinonException

Force retry the whole flow - if flow arguments are provided, flow will continue where it was left.

exception selinon.errors.FatalTaskError[source]¶

Bases: selinon.errors.SelinonException

An exception that is raised by task on fatal error - task will be not retried.

exception selinon.errors.FlowError(state)[source]¶

Bases: selinon.errors.SelinonException

An exception that is raised once there is an error in the flow on runtime - some nodes failed.

state¶

Get structured flow state.

exception selinon.errors.MigrationException(*args, migration_version, latest_migration_version, tainting_nodes=None, tainted_edge=None)[source]¶

Bases: selinon.errors.SelinonException

Base exception for migration related exceptions.

TAINTED_FLOW_STRATEGY = 'UNKNOWN'¶

exception selinon.errors.MigrationFlowFail(*args, migration_version, latest_migration_version, tainting_nodes=None, tainted_edge=None)[source]¶

Bases: selinon.errors.MigrationException

An exception raised when a flow should fail - i.e. migration causing tainting of flow should fail flow.

TAINTED_FLOW_STRATEGY = 'FAIL'¶

exception selinon.errors.MigrationFlowRetry(*args, migration_version, latest_migration_version, tainting_nodes=None, tainted_edge=None)[source]¶

Bases: selinon.errors.MigrationException

An exception raised when a flow should be retried - i.e. migration causing tainting of flow should retry flow.

TAINTED_FLOW_STRATEGY = 'RETRY'¶

exception selinon.errors.MigrationNotNeeded[source]¶

Bases: selinon.errors.SelinonException

Raised when a migration is requested, but config changes do not require it.

exception selinon.errors.MigrationSkew(*args, available_migration_version)[source]¶

Bases: selinon.errors.SelinonException

Raised if worker hasn’t needed migration files.

exception selinon.errors.NoParentNodeError[source]¶

Bases: selinon.errors.SelinonException

An exception raised when requested parent node (task/flow), but no such parent defined.

exception selinon.errors.RequestError[source]¶

Bases: selinon.errors.SelinonException

An error raised if there was an issue with request issued by user - usually means bad usage error.

exception selinon.errors.Retry(countdown)[source]¶

Bases: selinon.errors.SelinonException

Retry task as would Celery do except you can only specify countdown for retry.

exception selinon.errors.SelectiveNoPathError[source]¶

Bases: selinon.errors.SelinonException

Raised when there is no path in the flow to requested node in selective task runs.

exception selinon.errors.SelinonException[source]¶

Bases: Exception

Base Selinon exception in exception hierarchy.

exception selinon.errors.StorageError[source]¶

Bases: selinon.errors.SelinonException

Raised to notify about storage errors (e.g. storage goes down).

exception selinon.errors.UnknownError[source]¶

Bases: selinon.errors.SelinonException

An error raised on unknown scenarios - possibly some bug in code.

exception selinon.errors.UnknownFlowError[source]¶

Bases: selinon.errors.SelinonException

Raised if there was requested or referenced flow that is not stated in the YAML configuration file.

exception selinon.errors.UnknownStorageError[source]¶

Bases: selinon.errors.SelinonException

Raised if there was requested or referenced storage that is not stated in the YAML configuration file.

exception selinon.errors.UnsupportedCeleryError[source]¶

Bases: Exception

An exception raised when using unsupported Celery version.